VEP - Analizer

(VEP) Analizer

Visual Evoked Potentials (VEP) Analizer

The visual evoked potential (VEP), or visual evoked response (VER), is a measurement of the electrical signal recorded at the scalp over the occipital cortex in response to light stimulus.

The light-evoked signal, small in amplitude and hidden within the normal electroencephalographic (EEG) signal, is amplified by repetitive stimulation and time-locked, signal-averaging techniques, separating it from the background EEG readings.

Diopsys NOVA-VEP

What is a Diopsys NOVA-VEP Vision Test?

It is a painless, safe, non-invasive vision test to objectively measure neurological responses of the entire visual pathway using visual evoked potential (VEP) technology.

It is much more than a common vision test.

Visual Evoked Potential

What is Visual Evoked Potential (VEP)?

Visual Evoked Potential is a non-invasive testing method that provides objective information about the function of the entire vision system. VEP provides a means to measure the complete visual pathway, from the lens to the visual cortex, to detect mechanical or neural abnormalities related to vision.

These problems are often subtle and difficult to detect. The VEP is an electrical signal generated in response to a known visual stimulus.

The potential is an electrical response to a stimulus. The Diopsys® NOVA-VEP Vision Testing Systems use visual stimuli in different patterns and contrasts to evoke the electrical response, or potential, in the brain.

Feel Relaxed

How should I prepare for the test?

All medications should be taken as usual unless otherwise directed by the doctor. Hair should be clean, dry, and free of any gels, sprays, or oils.

It is important that you feel relaxed and comfortable so the test results are accurate.

For young children, it may be helpful to bring a favorite item such as a blanket, pacifier, or toy that will make them feel more comfortable

Test Done

How is the test done?

The technician will attach three small sensory pads to your head using a washable gel material. You will be seated in front of a screen and asked to stare at the center.

The screen will display different size patterns that quickly reverse. One eye may be covered while the other eye is tested. A computer records your response.

The testing time may vary depending on what tests your doctor orders

Very Important

What else do I need to know??

You must sit still during the test.

Relaxation is an important part of the test.

After the Test

What can I expect after the test?

After the test, the technician will remove the sensory pads and use a small amount of water to remove any gel residue. The test results will be given to your doctor.

Ophthalmologist vs Optometrist

How should I prepare for the test?

Wondering if your eye care specialist is an optometrist or ophthalmologist?

An optometrist (OD) is an eye specialist trained to diagnose, treat and monitor eye and vision care, eye diseases, and related conditions, and prescribe eyeglasses, contact lenses, and medications to treat eye disorders.

An ophthalmologist is a medical doctor (MD) or doctor of osteopathy (DO) specializing in the treatment of diseases of the eye and vision, they usually specialize in eye surgery.

What is glaucoma?

What causes glaucoma?

According to the Glaucoma Research Foundation, a glaucoma is a group of eye diseases that gradually steal sight without warning. In the early stages of the disease, there may be no symptoms.

Experts estimate that half of the people affected by glaucoma may not know they have it.

Vision loss is caused by damage to the optic nerve. This nerve acts like an electric cable with over a million wires. It is responsible for carrying images from the eye to the brain.

There is no cure for glaucoma yet. However, medication or surgery can slow or prevent further vision loss. Early detection is vital to stopping the progress of the disease.

Signs and Symptoms of

Glaucoma

Depending on the type of glaucoma you have, you may experience a gradual loss of peripheral vision, tunnel vision, halos around lights, blurred vision, severe eye pain, sudden onset of visual disturbance, often in low light, and reddening of the eye.

Do not wait to visit your eye doctor until you have a problem because, in the early stages of the disease, there may be no symptoms.

Regular eye exams are the key to detecting glaucoma early enough for successful preventive treatment.

What is

Diabetic Retinopathy?

The National Eye Institute defines diabetic retinopathy as an eye disease that causes changes in the blood vessels of the retina that results in a complication of diabetes. In some people with diabetic retinopathy, blood vessels may swell and leak fluid.

In other people, abnormal new blood vessels grow on the surface of the retina.

In the early stages of the disease, there may be no symptoms; but, over time, diabetic retinopathy can get worse and cause vision loss. Diabetic retinopathy usually affects both eyes.

Signs and Symptoms of

Diabetic Retinopathy

The National Eye Institute defines diabetic retinopathy as an eye disease that causes changes in the blood vessels of the retina that results in a complication of diabetes. In some people with diabetic retinopathy, blood vessels may swell and leak fluid.

In other people, abnormal new blood vessels grow on the surface of the retina.

​​​​​​​In the early stages of the disease, there may be no symptoms; but, over time, diabetic retinopathy can get worse and cause vision loss. Diabetic retinopathy usually affects both eyes.

What is

multiple sclerosis (MS)?
​​​​​​​

According to the Glaucoma Research Foundation, glaucoma is a group of eye diseases that gradually steal sight without warning. In the early stages of the disease, there may be no symptoms.

Experts estimate that half of the people affected by glaucoma may not know they have it.

Vision loss is caused by damage to the optic nerve. This nerve acts like an electric cable with over a million wires. It is responsible for carrying images from the eye to the brain.

There is no cure for glaucoma yet. However, medication or surgery can slow or prevent further vision loss. Early detection is vital to stopping the progress of the disease.

Signs and Symptoms of

Multiple Sclerosis

Symptoms of MS are unpredictable and vary from person to person, and from time to time in the same person. MS can cause blurred vision, loss of balance, poor coordination, slurred speech, tremors, numbness, extreme fatigue, problems with memory and concentration, paralysis, blindness, and more.

These problems may be permanent or may come and go. Most people are diagnosed between the ages of 20 and 50, although individuals as young as 2 and as old as 75 have developed it.

Multiple sclerosis is not considered a fatal disease as the vast majority of people with it live a normal life span. But they may struggle to live as productively as they desire, often facing increasing limitations.

Ultrasound Tomography

(TBI)?
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The National Institute of Neurological Disorders and Stroke says traumatic brain injury (TBI), a form of acquired brain injury, occurs when a sudden trauma causes damage to the brain.

TBI can result when the head suddenly and violently hits an object, or when an object pierces the skull and enters brain tissue.

Signs and Symptoms of

Traumatic Brain Injury
​​​​​​​

Three-dimensional ultrasound tomography of the eye is a new advanced technique of ocular ultrasonography. The aim of this work was to present a new interesting ultrasound unit with the possibility of three-dimensional ultrasound tomography, after half a year of experience with this system.

​​​​​​​The article describes scanning techniques using a commercial 3-D ultrasound system (OTI-Scan 1000) and presents how to assess the dimensions of intraocular structures and document them volumetrically.

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